论文标题
轴支电动力学和磁流失动力学
Axion electrodynamics and magnetohydrodynamics
论文作者
论文摘要
我们在宇宙学背景下制定轴突 - 电动力学和磁流失动力学（MHD），假设重力较弱。这两种公式是针对具有$ f（ϕ）$耦合的一般标量场制成的，而轴为具有$ ϕ^2 $ - 耦合的大型标量场，并带有螺旋电磁场。 $α$ -DYNAMO术语自然来自MHD公式中的螺旋耦合。然而，在存在电磁耦合的情况下，相干振荡轴的Schrödinger和流体动力学公式是{\ IT}，用于常规$ ϕ $耦合；取而代之的是，$ ϕ^2 $耦合允许成功的配方将轴突的暗物质性质保存到非线性顺序。在MHD公式中，标量和电磁场之间的直接耦合仅用于非理想的MHD。我们研究标量场和轴突MHD的重力和磁性不稳定性。
We formulate axion-electrodynamics and magnetohydrodynamics (MHD) in the cosmological context assuming weak gravity. The two formulations are made for a general scalar field with general $f(ϕ)$-coupling, and an axion as a massive scalar field with $ϕ^2$-coupling, with the helical electromagnetic field. The $α$-dynamo term appears naturally from the helical coupling in the MHD formulation. In the presence of the electromagnetic coupling, however, the Schrödinger and hydrodynamic formulations of the coherently oscillating axion are {\it not} available for the conventional $ϕ$ coupling; instead, $ϕ^2$ coupling allows successful formulations preserving the dark matter nature of the axion to nonlinear order. In the MHD formulation, direct couplings between the scalar and electromagnetic fields appear only for non-ideal MHD. We study gravitational and magnetic instabilities of the scalar field and axion MHDs.
